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Crimmins MT, Dechert AMR. Enantioselective synthesis of the C1-C6 and C7-C23 fragments of the proposed structure of iriomoteolide 1a. Org Lett 2012; 14:2366-9. [PMID: 22512249 PMCID: PMC3345064 DOI: 10.1021/ol300785c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Synthesis of the C1-C6 and C7-C23 fragments of the proposed structure of iriomoteolide 1a has been accomplished. Key steps include a cross metathesis to form the C15-C16 E olefin and a chelation controlled Grignard addition to form the tertiary alcohol at C14. Notably, 7 of the 9 stereocenters of the proposed structure have been set using various aldol reactions employing metallo enolates of thiazolidinethiones.
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Affiliation(s)
- Michael T Crimmins
- Kenan, Caudill, Venable and Murray Laboratories of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States.
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Abstract
A protecting group free and biomimetic total synthesis of (+)-ainsliadimer A has been accomplished in 14 steps from α-santonin. The synthesis relies on a hydrogen bonding promoted [4 + 2]-hetero-Diels-Alder dimerization to afford the key homodimer intermediate, which demonstrates the feasibility of using nonenzymatic conditions to achieve the proposed biosynthesis.
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Affiliation(s)
- Chao Li
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
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Esmieu WR, Worden SM, Catterick D, Wilson C, Hayes CJ. A Formal Synthesis of (-)-Cephalotaxine. Org Lett 2008; 10:3045-8. [DOI: 10.1021/ol8010166] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- William R. Esmieu
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K., and GlaxoSmithKline, Old Powder Mills, Tonbridge, Kent TN11 9AN, U.K
| | - Stephen M. Worden
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K., and GlaxoSmithKline, Old Powder Mills, Tonbridge, Kent TN11 9AN, U.K
| | - David Catterick
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K., and GlaxoSmithKline, Old Powder Mills, Tonbridge, Kent TN11 9AN, U.K
| | - Claire Wilson
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K., and GlaxoSmithKline, Old Powder Mills, Tonbridge, Kent TN11 9AN, U.K
| | - Christopher J. Hayes
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K., and GlaxoSmithKline, Old Powder Mills, Tonbridge, Kent TN11 9AN, U.K
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Chrobok A, Gössinger E, Grünberger K, Kählig H, White M, Wuggenig F. Towards EPC-syntheses of the structural class of cochleamycins and macquarimicins. Part 3: EPC-syntheses of the β-keto lactone subunits and first attempts towards the syntheses of the pentacyclic antibiotics of this group. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.05.093] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Towards EPC-syntheses of the structural class of cochleamycins and macquarimicins. Part 1: EPC-synthesis of the hydrindene subunit of the cochleamycins. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.05.092] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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